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Error code reference

LG Range Error Code F6

Upper oven overheating

LG codesLG range codes

Upper oven overheating — oven temperature is over 650°F continuously for 2 minutes during cooking (except self-cleaning).

First step from the service manual

Check oven sensor resistance at pins 4 and 5 of CN60; normal is approximately 1.09 kΩ at 75°F.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F6 means on a LG range

The F6 error code on an LG range indicates that the upper oven has exceeded 650°F continuously for a period of 2 minutes during a normal cooking cycle. This threshold is distinct from self-cleaning mode, where high temperatures are expected and managed differently by the control board. When the oven temperature sensor (RTD probe) reports temperatures above this limit outside of a self-clean cycle, the control board triggers F6 as a protective fault to prevent damage to internal components, wiring, and potential safety hazards.

The oven temperature sensor is the primary component involved in this fault. At a room temperature of approximately 75°F, a healthy sensor should measure around 1.09 kΩ of resistance at connector CN60, pins 4 and 5. A sensor that has drifted low in resistance will report falsely elevated temperatures to the control board, triggering an overtemp fault even when the actual oven cavity temperature is within a normal range. Conversely, a legitimate overtemperature condition can result from a stuck or shorted bake or broil relay on the control board that keeps a heating element energized without command.

Diagnosis should begin by measuring sensor resistance at pins 4 and 5 of CN60 with the oven at room temperature. If resistance deviates significantly from 1.09 kΩ, sensor replacement is the likely fix. If the sensor reads correctly, attention should shift to the control board and its relays, as a welded relay contact can hold a heating element on continuously regardless of the control signal. Wiring between the sensor and control board should also be inspected for shorts or damaged insulation that could produce inaccurate resistance readings.

Source: manufacturer service documentation.

Common causes of F6

  1. 01

    Faulty oven temperature sensor

    Part replacement

    A worn or failing RTD temperature sensor can drift out of its calibrated resistance range, causing it to report falsely high temperatures to the control board. Check resistance at CN60 pins 4 and 5; a reading significantly below 1.09 kΩ at room temperature confirms a bad sensor.

  2. 02

    Stuck or welded relay on the control board

    Part replacement

    A relay on the control board that has welded contacts will keep the bake or broil element energized continuously, causing actual oven temperature to climb beyond safe limits. If the sensor resistance checks out correctly, the control board should be inspected as the next suspect.

  3. 03

    Wiring short between sensor and control board

    Wiring / connection

    Damaged or shorted wiring in the harness connecting the temperature sensor to CN60 on the control board can produce artificially low resistance readings, which the board interprets as an extremely high temperature. Inspect the wiring for melted insulation, pinched wires, or contact with oven cavity surfaces.

  4. 04

    Loose or corroded connector at CN60

    Wiring / connection

    A poor connection at pins 4 and 5 of CN60 can introduce erratic resistance readings that trigger a false overtemperature fault. Inspect the connector for corrosion, bent pins, or a loose fit and reseat or clean as needed.

  5. 05

    Actual oven cavity overheating

    Wiring / connection

    In some cases the oven genuinely is overheating, which can occur if the door gasket is failing and causing heat to build abnormally, or if a previous repair left calibration settings incorrect. Verify actual oven temperature with a calibrated thermometer to rule this out.

See the test procedure for each cause

Frequently asked questions about F6

What does F6 mean on a LG range?
F6 on an LG range means the upper oven temperature exceeded 650°F continuously for at least 2 minutes during a regular cooking cycle, not during self-cleaning. The control board triggers this fault as a safety measure to protect the oven and prevent a potential hazard. It typically points to a faulty temperature sensor, a stuck relay on the control board, or a wiring issue in the sensor circuit.
Can I fix the F6 error code myself?
Some causes of F6 are DIY-friendly, such as checking and reseating the connector at CN60 or inspecting the wiring harness for visible damage. Testing the oven sensor resistance at pins 4 and 5 of CN60 requires a multimeter but is manageable for a confident DIYer. Replacing a control board with a stuck relay is also possible for someone comfortable with appliance disassembly, though working around high-voltage components always carries risk and should be approached carefully.
Is it safe to use my LG range while the F6 code is showing?
No, you should not continue using the oven while the F6 fault is active. The code indicates either a genuine overtemperature condition or a sensor or control board failure that could allow the oven to overheat without warning. Continued use under either condition carries a fire and damage risk, so the fault should be diagnosed and resolved before cooking again.
Will resetting the range clear the F6 error?
Resetting the range by unplugging it or tripping the breaker for a few minutes may temporarily clear the F6 code, but the fault will return if the underlying problem is not corrected. A faulty sensor, shorted wiring, or a stuck relay will trigger the code again as soon as the oven is used. A reset is useful for confirming the fault is persistent, but it is not a repair.
How much does it cost to repair an F6 error on an LG range?
Repair costs depend on the failed component. An oven temperature sensor is typically the least expensive fix, with parts generally ranging from $20 to $60 and professional labor adding $80 to $150 or more depending on your area. A control board replacement is more costly, with parts often ranging from $100 to $300 or higher, plus labor. Getting a diagnosis from a qualified technician first can help avoid replacing the wrong part.

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